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Complex refractive indices in the infrared of nitric acid trihydrate aerosols
Author(s) -
Richwine L. J.,
Clapp M. L.,
Miller R. E.,
Worsnop D. R.
Publication year - 1995
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/95gl02650
Subject(s) - refractive index , scaling , infrared , nucleation , scattering , materials science , spectral line , nitric acid , optics , analytical chemistry (journal) , molecular physics , physics , chemistry , thermodynamics , mathematics , chromatography , geometry , astronomy , metallurgy
The refractive indices of nitric acid trihydrate (NAT) have been determined from the infrared spectra of laboratory generated aerosols. The aerosols are formed via homogeneous nucleation in a flow cell with separate regions for nucleation and observation, allowing for independent control of the temperature conditions in these regions. A spectrum of small, non‐scattering particles is recorded to determine the frequency dependent imaginary refractive index, within a scaling factor. A subtractive Kramers‐Kronig routine is then used to calculate the real index. The scaling factor for the imaginary indices is determined by fitting a spectrum associated with larger, scattering particles, which depends on both the real and imaginary portions of the refractive indices. The complex refractive indices of NAT are reported over the range 700 cm −1 to 4000 cm −1 . While in good qualitative agreement with previously reported results, there are significant quantitative differences which are discussed.